Séguédine Fm
Period:
Cretaceous
Age Interval:
Upper Cretaceous (Coniacian to Campanian) (8b)
Province:
East Niger Rift Basin - Bilma Sub-basin
Type Locality and Naming
Faure, 1966
References: Faure, 1966; Fabre et al., 1983; Meister et al., 1994;
Synonym: Seguedine Fm; ArenEquivalent(s): Kafra Fm, Agadem Fm
Lithology and Thickness
The formation comprises fine to medium heterogeneous sandstones with cross-bedded stratification and beds and lenses of only kaolinitic clay, with regular beds of ferruginous siltstones of flaky appearance on outcrops. Thickness is 100 to 200 m.
Lithology Pattern:
Fine-grained sandstone
Relationships and Distribution
Lower contact
Underlain by the Arentigué Fm
Upper contact
Overlain by the Emi-Bao Fm
Regional extent
The formation extends in the plain, to the west of the oasis of Kafra, and goes under the Bilma cliff.
GeoJSON
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Fossils
Well-preserved imprints of dicotyledonous Angiosperm leaves
Age
Upper Cretaceous (Coniacian to Campanian)
Age Span:
Beginning stage:
Coniacian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
89.39
Ending stage:
Campanian
Fraction up in the ending stage:
1.0
Ending date (Ma):
72.17
Depositional setting
Continental and marine
Depositional pattern:
Additional Information
Compiler:
Jacques LeBlanc (2022), Stratigraphic Lexicon: The Sedimentary Formations of The Republic of Niger, Africa. Colnes Publishing (Tallin, Estonia), 365 pp. https://doi.org/10.47909/978-9916-9760-6-7 (or via https://sites.google.com/site/leblancjacques)